Why do we say that absolute error is always positive?
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If you measure the same object two different times, the two measurements may not be exactly the same. The difference between two measurements is called a variation in the measurements.
Another word for this variation - or uncertainty in measurement - is "error." This "error" is not the same as a "mistake." It does not mean that you got the wrong answer. The error in measurement is a mathematical way to show the uncertainty in the measurement. It is the difference between the result of the measurement and the true value of what you were measuring.
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